CN211825570U - Particulate matter concentration detection device - Google Patents
Particulate matter concentration detection device Download PDFInfo
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- CN211825570U CN211825570U CN202020188704.7U CN202020188704U CN211825570U CN 211825570 U CN211825570 U CN 211825570U CN 202020188704 U CN202020188704 U CN 202020188704U CN 211825570 U CN211825570 U CN 211825570U
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Abstract
The utility model provides a particulate matter concentration detection device, which belongs to the field of detection devices, and comprises a sampling head, a sensor and an air filter, and also comprises a valve for communicating the sampling head with the sensor when the sensor works and communicating the sampling head with the air filter when the sensor does not work; the filter membrane clamp and the filter membrane arranged in the filter membrane clamp; the sampling head, the valve, the sensor and the filter membrane clamp are connected in sequence; the air inlet of the air filter is connected with the valve, and the air outlet of the air filter is connected with the air inlet of the sensor. The utility model overcomes there is the problem that the detection precision is low when currently utilizing optical sensor to detect particulate matter concentration, has the characteristics of detecting the precision height, long service life.
Description
Technical Field
The utility model belongs to the detection device field especially relates to a particulate matter concentration detection device.
Background
Particulate matter is of great interest as one of the important pollutants in air, and therefore, accurate measurement of particulate matter concentration is of great importance. The optical sensor is adopted to detect the concentration of the particulate matter, and has the advantages of high detection speed, simple structure, low cost and the like. However, the optical sensor has fatal defects such as long-term instability and short service life (generally 1 year), and therefore, the optical sensor needs to be cleaned and maintained regularly or needs to be replaced with a new sensor frequently, otherwise, the detection accuracy is affected.
Chinese patent CN 207472723U discloses a particle concentration detection system with self-zeroing calibration, the detection system includes a signal processing unit, an optical sensor and an ambient air purification device, wherein, the optical sensor senses the air sample entering its particle detection area and outputs the detected electrical signal, the signal processing unit determines the detected particle concentration according to the electrical signal, a diversion channel is provided between the ambient air purification device and the optical sensor so that the ambient air can smoothly flow through the particle detection area when the ambient air purification device does not work, and the ambient air purification device introduces the purified clean air to the particle detection area when working.
Above-mentioned patent has realized detecting system's autozeroing through set up the water conservancy diversion passageway between ambient air purifier and light sensor, has improved the precision that detects to a certain extent, has prolonged the life of sensor simultaneously. However, the above detection system does not have a function of correcting the measurement, and therefore, it still cannot overcome the problem that the optical sensor has low detection accuracy when detecting the particulate matter concentration.
Disclosure of Invention
The utility model discloses to foretell problem that exists when utilizing optical sensor to detect particulate matter concentration and detect the precision low, provide a particulate matter concentration detection device with detect that the precision is high, long service life.
In order to achieve the above object, the utility model discloses a technical scheme be:
the utility model provides a particulate matter concentration detection device, which comprises a sampling head, a sensor and an air filter, and further comprises a valve for communicating the sampling head with the sensor when the sensor works, and communicating the sampling head with the air filter when the sensor does not work;
the filter membrane clamp comprises a filter membrane clamp and a filter membrane arranged in the filter membrane clamp;
the sampling head, the valve, the sensor and the filter membrane clamp are connected in sequence; the air inlet of the air filter is connected with the valve, and the air outlet of the air filter is connected with the air inlet of the sensor.
Preferably, the valve is a three-way electromagnetic valve; the inlet of the three-way electromagnetic valve is connected with the sampling head, one outlet of the three-way electromagnetic valve is connected with the sensor, and the other outlet of the three-way electromagnetic valve is connected with the air filter.
Preferably, the air filter further comprises a first channel for connecting the sensor and the outlet of the three-way electromagnetic valve, a second channel for connecting the air filter and the other outlet of the three-way electromagnetic valve, and a third channel for communicating the air filter and the sensor, wherein the third channel is connected with the first channel.
Preferably, the device also comprises a suction pump connected with the filter membrane clamp.
Preferably, the air filter is a 0.2 μm air filter.
Preferably, the device further comprises an MCU controller electrically connected with the three-way electromagnetic valve.
Compared with the prior art, the utility model discloses an advantage and beneficial effect lie in:
1. the utility model provides a particulate matter concentration detection device, through set up the filter membrane clamp at the sensor rear end, and set up the filter membrane in the filter membrane clamp, realized the correction to the measuring result, further improved the detection precision of sensor when measuring particulate matter concentration;
2. the utility model provides a particulate matter concentration detection device through setting up the MCU controller, has realized detecting and has washd the automatic switch-over of returning to zero, has improved work efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a particulate matter concentration detection apparatus according to an embodiment of the present invention;
in the above figures: 1. a sampling head; 2. a sensor; 3. an air filter; 4. a valve; 5. filter membrane clamping; 6. an air pump; 71. a first channel; 72. a second channel; 73. a third channel.
Detailed Description
The present invention is specifically described below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in fig. 1, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
The terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or more of the features.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example (b): as shown in figure 1 of the drawings, in which,the embodiment provides a particulate matter concentration detection device, which comprises a sampling head 1, a sensor 2, an air filter 3, a valve 4, a first control valve and a second control valve, wherein the valve 4 is used for communicating the sampling head 1 with the sensor 2 when the sensor 2 works and communicating the sampling head 1 with the air filter 3 when the sensor 2 does not work; a filter membrane clamp 5 and a filter membrane arranged in the filter membrane clamp 5; the sampling head 1, the valve 4, the sensor 2 and the filter membrane clamp 5 are connected in sequence; the air inlet of the air filter 3 is connected with the valve 4, and the air outlet of the air filter 3 is connected with the air inlet of the sensor 2. This particulate matter concentration detection device is through setting up filter membrane clamp 5 at sensor 2 rear end, and sets up the filter membrane in filter membrane clamp 5, has realized the correction to measuring result, has further improved the detection precision of sensor 2 when measuring particulate matter concentration. Because the sensor 2 has zero point error, the zero point value needs to be measured by passing pure gas, and then the sensor 2 can be zeroed by the following formula. Sensor 2 zero calibration equation: p0+B00, in the formula B0I.e. zero point, P0Is the measured value of the sensor 2; ideally, the air passing through the filter 2 is pure air, and the data measured by the sensor 2 is B0The value is obtained. It should be noted that, this embodiment links to each other with sensor 2 air inlet through restricting 3 air outlets of air cleaner, and sets up filter membrane clamp 5 at sensor 2 air outlet end, and the air after 3 purifications of air cleaner gets into sensor 2, further is gathered by the filter membrane in the filter membrane clamp 5, and then realizes rectifying through weighing method, has improved the precision that detects.
In order to realize the efficient switching between detection and zero return, the valve 4 is a three-way electromagnetic valve; the inlet of the three-way electromagnetic valve is connected with the sampling head 1, one outlet of the three-way electromagnetic valve is connected with the sensor 2, and the other outlet of the three-way electromagnetic valve is connected with the air filter 3.
Furthermore, the air purifier further comprises a first channel 71 used for connecting the sensor 2 with an outlet of the three-way electromagnetic valve, a second channel 72 used for connecting the air filter 3 with another outlet of the three-way electromagnetic valve, and a third channel 73 used for communicating the air filter 3 with the sensor 2, wherein the third channel 73 is connected with the first channel 71.
In order to improve the air inlet efficiency, an air suction pump 6 connected with the filter membrane clamp 5 is also included.
In order to filter out the particles in the air and keep the air clean, the air filter 3 is a 0.2 μm air filter 3. This embodiment defines in particular the filtering dimensions of the air filter 3, since this dimensions not only guarantee the filtering effect, but at the same time are economical and practical.
In order to realize the automatic switching of detection and cleaning return-to-zero, the cleaning device also comprises an MCU controller electrically connected with the three-way electromagnetic valve. In this embodiment, the MCU controller is arranged to control the opening and closing of the solenoid valve, so as to realize the automatic switching between the detection of the sensor 2 and the zeroing correction, specifically, the method of sampling for 45s and performing the zeroing correction for 15s is adopted to achieve the purpose of cleaning the sensor 2 and performing the zeroing correction.
The detection, zero setting and correction processes of the particulate matter concentration detection device are as follows:
the sampling head 1 is divided into two paths after collecting gas, one path is connected with the sensor 2 to directly detect, the other path is connected with the air filter 3, a filter screen is arranged in the air filter, particles can be filtered when the gas to be detected passes through, and clean gas is generated to be used for cleaning the sensor 2.
The detection process comprises the following steps:
controlling the sensor 2 to be in a communication state with the sampling head 1 through the valve 4, controlling the air filter 3 to be in a non-communication state with the sampling head 1, and detecting gas to be detected entering the sensor 2 through the sampling head 1 to obtain a detection result;
the cleaning zeroing and correcting process comprises the following steps:
the air filter 3 and the sampling head 1 are controlled to be in a communicated state through the valve 4, the sensor 2 and the sampling head 1 are not communicated, gas enters the air filter 3 through the sampling head 1, the gas purified by the air filter 3 enters the sensor 2 from the air inlet of the sensor 2, and the sensor 2 is cleaned and zeroed;
and the gas cleaned from the sensor 2 enters the filter membrane clamp 5 through the outlet of the sensor 2, so that the detection result is corrected.
Claims (6)
1. The utility model provides a particulate matter concentration detection device, includes sampling head (1), sensor (2) and air cleaner (3), its characterized in that:
the device also comprises a valve (4) for communicating the sampling head (1) with the sensor (2) when the sensor (2) is working and communicating the sampling head (1) with the air filter (3) when the sensor (2) is not working;
the filter membrane clamp (5) and the filter membrane arranged in the filter membrane clamp (5);
the sampling head (1), the valve (4), the sensor (2) and the filter membrane clamp (5) are connected in sequence; the air inlet of the air filter (3) is connected with the valve (4), and the air outlet of the air filter (3) is connected with the air inlet of the sensor (2).
2. The particulate matter concentration detection apparatus according to claim 1, characterized in that: the valve (4) is a three-way electromagnetic valve; the inlet of the three-way electromagnetic valve is connected with the sampling head (1), one outlet of the three-way electromagnetic valve is connected with the sensor (2), and the other outlet of the three-way electromagnetic valve is connected with the air filter (3).
3. The particulate matter concentration detection apparatus according to claim 2, characterized in that: the sensor is characterized by further comprising a first channel (71) used for connecting the sensor (2) with an outlet of the three-way electromagnetic valve, a second channel (72) used for connecting the air filter (3) with the other outlet of the three-way electromagnetic valve, and a third channel (73) used for communicating the air filter (3) with the sensor (2), wherein the third channel (73) is connected with the first channel (71).
4. The particulate matter concentration detection apparatus according to claim 1, characterized in that: also comprises an air pump (6) connected with the filter membrane clamp (5).
5. The particulate matter concentration detection apparatus according to claim 1, characterized in that: the air filter (3) is a 0.2 μm air filter (3).
6. The particulate matter concentration detection apparatus according to claim 2, characterized in that: and the MCU controller is electrically connected with the three-way electromagnetic valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020188704.7U CN211825570U (en) | 2020-02-20 | 2020-02-20 | Particulate matter concentration detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020188704.7U CN211825570U (en) | 2020-02-20 | 2020-02-20 | Particulate matter concentration detection device |
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| Publication Number | Publication Date |
|---|---|
| CN211825570U true CN211825570U (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020188704.7U Active CN211825570U (en) | 2020-02-20 | 2020-02-20 | Particulate matter concentration detection device |
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| CN (1) | CN211825570U (en) |
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2020
- 2020-02-20 CN CN202020188704.7U patent/CN211825570U/en active Active
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